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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb59d76630c4e4ff9a0fd5f27bd10d4ec4e666ac55933b5070a97ea5c58c9b7' 
  AND token = 'q3H3vTJ0izrDJHq37la2XWvFmOCoE3DBiti7oMduhwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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