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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08ac3b9c920dcd5314fd927a0ebd1091564c77b924b1bdcc64ef1d0603a8487' 
  AND token = 'O838lKS16Sx58kc08mKUCERl8W1ha9+G8UdAvbHVUPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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