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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928df77e21faad42238752bbbcead5d15522069b0a37e2ca8b6d250ff32dd3d1' 
  AND token = 'PmJJT0nzN+31IZyIR8N7kepLV8J5PMn6/DoDMqvtu8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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