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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b582fe11a069cb859203ba672bb3fdccd536b60fc0c83b9c084be30d0f3c2632' 
  AND token = 'sH93MqDHlSr/PMIfqQpniBDVz3QDELLL+MVyh0SIhYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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