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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec95ef1e8c7cca92092876ec2b6411513f91c5fbd6c7bb36ffe4fd576db888c9' 
  AND token = 'bcFqtZVtze1c2DsAj+XrKTKMb+9CGTukizO6C2qgalI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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