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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285ff01212e3b1a5d824971ca36c05ad2a8eb3d2237fb2660f146275b528e763' 
  AND token = 'XxGlzG2LDINsnU0owievPvFYTU2ncsGOt+yEJeOG3po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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