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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99bbcf818a8da90a2006210ddd538eb039cf3020c75b75116860ec0150b4162f' 
  AND token = 'AmYjKqbuoWkbLS5s5TvI8H8EsmWQL2NN9rEqeCXR40g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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