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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d702e058cd68eb4da4f4324f5923e9e6f1650bfbd3035f937fa2fee821e8ad' 
  AND token = 'EAEs7GX/utMuKrB7KEkdIkMoDd+Ya2y4RLMmn+wneEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}