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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e28b41c967a0a0b12507b5cc5d41ff4824c210a5fc0f51591abfca5d28eedae' 
  AND token = '0Cx+MDC5zZmW3GuuJcyoTrrBPf/z2KWteuYEt5gDM2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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