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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85e2447522e6191f067d6021b84e1ac937e54ae9538545189c66bb0e6f796d3' 
  AND token = 'n12BQCB04eFPOBlc62sz5sZ7lpqnbnSvx5LQcANM3lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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