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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab4b08b72dd4fb0218db0a89aac204ff67fcd61fab321f461d18219fe42a36e' 
  AND token = 'ENeFj2HOkYzOJF+Sc6KvyhTmsMdAgZdNS0nApfJrjZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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