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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8392a03e85975f38246f67eaf327d0bc9e0e66bfca9bd5d649ae04a79a8b57b' 
  AND token = 'rTyoqFziDWmNEv5xxEYE32/wXY7i1thtkqpvh4BP05Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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