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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70913ee786928d01625c8cfc76be5bd3b74fa32bcef3b7ef5201efbdae691e5' 
  AND token = 'xU65nB3g5BqV6EuS3IOzTYMkptmTU8iCWT3JaXdNfNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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