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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b376d7708d30e3d0e95ac2ef8b74f1337156cfb1c155f1a1718b06ad6686cb' 
  AND token = 'ym8L5/Gwj2AzJU927r8pSPdVRr0n/LI/6cG0ktg2ZBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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