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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dd216916a50e040e4440c5c039ee21a2895dd0cc5646714f868533c8392ff9' 
  AND token = 'VCmfoys5PCQV8v1ZdK07bFz6wrfd6WiGFIenIMaE16g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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