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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56206337185a4eeb5b7f7607d4832c1dcd7277f67745232f0d0fa8e08287c32d' 
  AND token = 'r2H8JkzlYeslIfx+y+2HCJ+kzJt58FdHx/m3K5RwiOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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