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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52c7c195e8d14ef0c4e92235f1c3702594e6187640e749c5c532ef677210f26' 
  AND token = 'Zj9r+p4olgIg1jtUKVEBmYtyO+eOOfL5uZFajiuHPYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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