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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a914758ce7a9d886667236946375ead569b2cdc94c6108bfa20e953287b394' 
  AND token = '1ca8xe4dklWmOVVuNmgX0b5pNpcTT2v6KhN4pQEiJ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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