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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df233425a4f710c11117e07abe7b35ecc18cffe2965ce866af22b03f9f60855' 
  AND token = 'a6SlnBU2/QTLrSoqylCtBZwPTg+aHGCBanW3I9Vnu8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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