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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201244787804f130b150625e650b401935682a11057a1136b371f2b0153e6957' 
  AND token = 'J6QXBQtQp1RejgbGPjwW2fFdXEwZjdvS4V3r0RhybGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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