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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da312fba84a18d72f6f7e0b7b7b22a059dc9223e26a946b0c050604c002e7ae4' 
  AND token = 'lWxh4ncEXkItXVNVl4fqXYhcWFzy5WUjCsYdAbNyur0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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