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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9152cc8cf5bdbc31c5d57d1880707386096d72b872ca8d497ba03c92c38557f1' 
  AND token = '93vbDeya2R9d4elsGXVZ820V9kz9Fi2FrCkzERNpoxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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