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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12b69cc81a9f7620e9e20375998d64c71b99f40cffdb2223332bd81c2393468' 
  AND token = 'Hx4knPbLLyoEis3hjyT+ZEhSCIHxhf6JRIBKlpIz+2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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