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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eadc1dc04add9b07b07119fd230c94dfd5b4411b91280669dd8093605db7fe89' 
  AND token = 'IJF9zkipE+oy2hPR5b53Pr8zjInFkMXgPCDPs6BGQkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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