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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0341998b782c953d7d36305079efb6d0e24c629aaae7835f539112e962b73f9a' 
  AND token = 'nPbh8kxO+buGYFX/ub+aScSwzeQx3LGu/vgG1Nto1RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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