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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499d29b73ced6d0926889810d3b88b2e175ed9f668c1398ac8c885c10c9184e3' 
  AND token = 'Bvw7ez095E17TH3f6OkCEC8ow4hTJo7zu8+gCPAzkxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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