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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5f9a9edc95b076bbf5b0abf82e25644c4257ccd7e5b8f690522c467ccfe5ef' 
  AND token = 'IQKZcdH7laeR3mhH6uc2VP14ZUwMtLuR+soNzB7I/qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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