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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea2dab021a210a65fe3a68f610b796d514ab37c6d7028d3d19a94ccd4981f82' 
  AND token = 'mskXHciWs+GzzKZN/Y5oA6x2Psh4cbqVaQDzdwa/aqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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