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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45aab4b715487b2c1532ee21c9d60eec027c25b579c2be74712c0178faf9c10' 
  AND token = 'v5n3VOIt87tdZbPEO3/3K8K5MRFY4URLZFt0QleldPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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