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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a7babcdf00a9b6dfa747832af223e7c256529ca074b182a0db94c80904f933' 
  AND token = 'psAn6FALJKWl/1uSZkX1ahVvD/SrbWhf7iO+n9bn4So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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