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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32909b91555d8b94003848072cfd998afaa804ac259f9163c138c27d2b9517df' 
  AND token = 'TEpM9Eraj6HVV6Z4gQon7AxA3Bg3i/BfKUK7KjD4YUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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