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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af5d45039f2cb9a574f7ed5897b6c565fc49161c1594b4cd4068f205ecef9fe' 
  AND token = 'Zd62pD4w19gzzagHAPkgS5dg1c4OUpRLuzumZmXvMyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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