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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532b126b38f5d557575ed37affc2d6f574e72b415374a01d1e91f5baa0600aea' 
  AND token = 'yiNKBEwKwjQ8u0YwQUBsAMcifSWQ+5btuuMefCyGR8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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