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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbba3d59abf0ecf767c6b355e55ffc753dbc019d45f8f9e8d555b91198305332' 
  AND token = 'fr7ynL7bFIHziW95QqiqhYz+etpMM0mUnwGKEWdZbJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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