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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abd88f51bb90782ac72f247a1c7a812a9db4f0b3d34e7a0675fa42f1816f45d' 
  AND token = 'yFM1+fvze7sxNVKpQZ/BLQjvIeq88ts+KKc5olr6rbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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