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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab67733c601e0cd2741525cc1f6ddee61c822bb3c1969f07ba6630242116e0e' 
  AND token = 'vxFZMVRn0h+1zfPcbRZy3iR3jSpBiA5LJZMfQuCrgsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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