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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de51c266a2f3a7852b5d7cec0a3233b361313c264287dcbaae73b5f790c8346' 
  AND token = '0bawTE36Nt+UdlGWy+dtLWX+to9l8feajRTismOXRzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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