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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd984c544fa16cb88f9fb8c7b48d9e9325fc26d49f681831bb0c4c65ed9b045' 
  AND token = 'BTdXOD3XSvmKWpAau9qGBPE7pAUrTLu9duvx5Dhdz+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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