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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856dec0d476a768f90f2d39000b338ccfbd94a1ee41aaf184eb4f83a15d99f6f' 
  AND token = 's7Ol19PeOaLa5EGk7dG+UATtbXEph5ADL2XrKXxjEOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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