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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03026df234d0755dd6727feedfa5d34edb58372c7fb1b5142a1c254504b4ea93' 
  AND token = 'FM+bqpZKjbgnm1Ej3WWc2SKUMiY35onV3z2fkiZ+buE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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