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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532951f2ac94d825985c889eeee9f73476161c7a2ec9fdda6ed49cd03487c3f9' 
  AND token = 'T+hamkEcYzZyjB9i9rLwp10WBAdX/Wu284iRL+NuZn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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