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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a1d93c697ae9fb96c1c48fc042de665e4466dfdc4ab2e51e42376a77ced067' 
  AND token = '6F6ov1rNnLgZ2WLZN0vBU6KgMGE6rMA8FwTQ1t1AjBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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