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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c998c74da43aa79577644bed6f32bac0bc2dfc33efe54dac4a49ab6a06aa44' 
  AND token = 'ydQCa9P8NkSt+lY6drqg/8tdB/fXHbZDR4gyLwMNYWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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