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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b87e1a29627b065317e38eda8c1d2dfcd03e5c65b119a08c2e80c9b8dbcd74' 
  AND token = 'ph1AwP2UAuSGF/atuh8+whkc/lRT/JXG2X4bw9uYCO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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