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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a04e6b0eb8d93b383c4fbb0a055e0f362e38da0417e0101c2cc8098b6f01a1' 
  AND token = 'AqvsZTdZE6E2D+1FLAGOdwlM6xi2/yncSihcrdHXBLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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