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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae8fdbbb703c69620a5c7a5e211241090dbe5ada7b95a135ab8f282f06fddd4' 
  AND token = '78E0anKQdRs0u+TSjca1Slmzz1HFJUdgUzizmHliWMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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