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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe654b5932add4e447c91186ff22baa7b01f3d9111b1360ac321325d6a636d0' 
  AND token = 'OeRfTExjswRhl0SIdUJjpuhwL8Tha88N3v7V5JdObMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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