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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c05bb9520e1dfbdacd25df58475b7801d070f7355f89ecc3f59e23eccd9c12f' 
  AND token = 'vmrWTazg7C9GWEPlCzCKonzdjrxHVypj5hL0gXXQ1Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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