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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7573baf0af0e8332714dbbc51eea3ef126ba88524799e0fafec93f3e37187fc' 
  AND token = 'JIdoF8yIX2R69JX39/nqTibxwiUG/Nq1hh50hyJECWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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