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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8808d3f61afda0b01ad96de7c1b016a9cd881c4cc6c10900c7768575a684175' 
  AND token = 'eDUCUogkomjSBbabN6GOA8d2VNsVHk0bXp7gNM79EpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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