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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c739aa5523731ad861a89e0f10088a37557269261ce0a5b586d6b715787ebad3' 
  AND token = 'ceXAZ52KEbw8CN3+ZNWDA8loI260ueh2/p7JC3/cEJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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