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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ce0db6e05259abf3e14f38037f79a9911f4e991c4cf3e48a9b4b5fe98bd898' 
  AND token = '4Eax5JflwR9b0pCbyytlMnxIuRGFPjXO+wlv0DPrMCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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