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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1967fc61c94b8f101ea9911281840e34dbb2c752aed53c025511be5583d8bf4d' 
  AND token = '22UY/3voYTPDzx3ST5shsZ9i8p9tT/qoxKlvDApmOAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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