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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43bac8740dc3f5d616cb06b4bf964df30c3e79d79682cab7842d4ce04cad737' 
  AND token = 'aOSI9gz1OGRrsEUcRA93McFD4dI+eYOaNR4KZjI05E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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