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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516fcb41f67036cf04f37c5cfe7824044d0dd277633ae1b29f0b814a8bf1d6e8' 
  AND token = 'Ajk4Jwv/B6NMHWE2Hg1kWA+CF3rkgZ2OTNH00mO9D5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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