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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ead13ae325f391005c4d5b57d3d55d76c51d63484d858c60933a0e6f02b8b0' 
  AND token = 'qTj9RYIN2ymgfaJem9/g6lpVtx+rBtlkVffmWKiPuYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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