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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbea2c9bc691f08a5a2b9f3f07b1e6f61438153d041234314bc4baa884975e2' 
  AND token = 'xkseXY15DdLFy2q06GaJvwebKeOLmX7icyhC+GlJOQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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