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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be855e5988ef15ab1ad88e3b1f08f8f8fe8062536bfadc896f61e3fcb9936791' 
  AND token = 'ubnjFyAcRA5oMG0jeHxIzUaDX8aKPNDfgsgxB2jo/mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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