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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecc26f185a61f0a86dd0c7108d4eeda0d8791dc1262187a3521c470146273c5' 
  AND token = 'Tm759d2wWBwESkg5ZC/Muw+kL4w14RwJWGUP2Nm9Qt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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