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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a20cfe6b07f53e45d875f02a9c6b786ec2de7f12ad6b23a02a64f647282b356' 
  AND token = 'Mv+/X+1u3/87i2WtKPLvDJGWGga9s5odYK1lR201gTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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