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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87422423c05581283950ddead7cf04bf2c686c2706afc99344141849642b550' 
  AND token = '6FHUzlm81gDa+6Xcalbut4dwWPiUm8L6erW6Zfo8tP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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