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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fa5fccab58b484e16a73c960defbf4803fa86291e7694c61aef55c932fd2fd' 
  AND token = 'T5pDrdo/Pc+pqU2BE/9ivy4lkLMbJTj3Vi6KIpk0vmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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