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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c070287e8f8c10d3dda999f26e7bfd4eb6afffa4f07efbc13539b86a9d9ad90' 
  AND token = 'fDowWk4ecSTP7mGLx2l5cGdLNrfTPKfSW3a0jVK2TCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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