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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dae2e4589955e0fe4244842f3760595a6396814d41ddc90a3d7275aeae71ce4' 
  AND token = 'ZEKVjf9lVDwQ9BfCaLTZkGLhbXk5L8BOHh2dJjDxyu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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