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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b23d881d2931666c91f619d5334f84e51281053fec3a86d3d384de9e3329c0' 
  AND token = 'AALiOcWvGUQNA+oT99PBhPliptoXYvo57y3xepP+lD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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