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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ad55dd6c6ed9e11e517f91f75a68ab2902da443578092e871ee0b82999e87f' 
  AND token = '7ALb1Goa4i9lfDciyieWWXcWipkuPp2Q2PUpSPABTo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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