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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56b62f0479a16b61139e058543e88c104950bee33de469f22cd752d8be0c4fd' 
  AND token = 'S5wC6UytCT4E42qvhFwDUI4ZoKPlBKf7NhO7BMikKIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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